Hey girl, I understand your search for inexpensive mineral make up, and along my search have found some amazing and inexpensive companies.
I am currently using Beauty from the Earth MMU and I really love it, it matches my skin tone and gives me a really flawless look. - (www.bftecosmetics.com). I really recommend them, their MMU is about $12
Another great MMU is Faerie Organic, they run around $19.00 but I rank their mineral make up very high; you can chose the coverage you want and it all goes on very nicely. (www.faerieorganic.com)
One more that I have to recommend is OceanMist MMU, (oceanmistcosmetics.com). Their MMU is $14 with the sifter jar and $12 without. They were the first MMU I ever tried and I really like them; however, my mom LOVES their products!
These cosmetic companies are all pretty indie, but their ingredients are all made without bismuth, talc and other skin aggravating ingredients; and they are all very affordable.
Hope this helps!!